Job seekers visit recruiters at a jobs fair in Green...

Job seekers visit recruiters at a jobs fair in Green Tree, Pa. The number of people seeking unemployment benefits plunged last week to the lowest level in four years, a hopeful sign for the struggling job market. (July 10, 2012) Credit: AP

Over the years, hiring managers have born witness to every hiring, interviewing, résumé, cover letter and negotiation mistake there is.

You know what these blunders are. We've told you several times. Yet you (and hundreds of other job seekers) continue to make common job search mistakes.

From those who see your mistakes over and over, here are 16 common job search mistakes to avoid -- and some of them may surprise you.

"By having many more irons in the fire, you diversify the risk and disappointment that is inevitable when any single opportunity disappears," adds Roy Cohen, author of "The Wall Street Professional's Survival Guide: Success Secrets of a Career Coach."

"You also present yourself as a more passionate and energetic candidate. You're in the 'zone' -- a point where you're in the flow of information and ideas -- and that makes you more valuable."

"If you are rejected for a job you should send a thank-you note, thank the employer for the opportunity, and wish them well. No one does that. When the next opening comes around, he'll remember you," says Hurwitz.

"Many applicants mistakenly believe they will be an appealing candidate if they explain they will accept any type of job offer at any because they have been laid off, unemployed for an extended period of time, have children in college, or are having difficulty making the mortgage payments," she says. "Even if all of those circumstances are true, candidates need to craft a different message, focusing on how they can benefit the employer by saving them money, streamlining processes, creating additional sources of revenue and bringing overall value to the company."

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